Poor Video Quality to Cisco Endpoints

The Problem

Video quality from the agent to the web client is good but video from the web client to the agent side is poor.

The Reason

The AS parameter in the SDP answer received from Cisco side is set too low, say to 320 or 376kbps. This is not enough bandwidth for the default or HD resolution configuration.

The Solution

The CUCM's bit rate configuration needs to be changed. This Configuration is explained here:http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_5_1/ccmcfg/bccm-851-cm/b02regio.html

You may follow steps below to increase the bit rates for video call in call manager (CUCM)  below

  • Login to Cisco Unified CM Administration.
  • Go to System -> Region Information –> Region.
  • Click on find button.
  • Click on Default link. Under Modify Relationship to other Regions legend in the column Maximum Session Bit Rate for Video Calls, 
  • Select the option with a text box and enter the value for Maximum Session Bit Rate for Video Calls that is needed in the text box
  • Click Save. 


We recommend you set this value to 4000 for initial testing, increasing to 12000 if this is not sufficient.

Note: Due to the complexities of the CUCM configuration other bit rates may take effect. The sdp.log in the media_broker/rtp-proxy-instances/mb-0 (or mb-*) can be checked to confirm if the new AS value is being offered. Go to the bottom of the file and search up for b=AS:





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